Stone-crusher



UITED STATES PATENT v trio SAMUEL L. MARSDEN, OF HAVEN, CONNECTICUT.

STONE-CRUSHER.

SPECIFICATION forming part of Letters Patent No. 230,304, dated July 20,1880.

Application filed October 14, 1879.

To, all whom it may concern:

Be it known that I, SAMUEL L. MARSDEN, of New Haven, in the county ofNew Haven and State of Connecticut, have invented a new and ImprovedStone and Ore Crusher, of which the following is a specification.

Figure l is a sectional longitudinal elevation on line a a, Fig. 2. Fig.2 is atransverse sectional elevation on line y y, Fig. 1. Fig. 3 is atransverse sectional elevation on line 2 2, Fig. 1.

Similar letters of reference indicate corresponding parts.

The invention relates to that class of crushers which operate with areciprocating moving jaw or jaws.

The invention consists in constructing a vertical-j awed ore-crusherwith an adjustable pitman, friction driving-pulleys, toggle-lever,toggle, and jaw-plates, as hereinafter set forth, so as to increase theefficiency, durability, and convenience of the machine.

In the drawings, A represents the crusherframe, and B the crank-shaft,supported in the journal-boxes'C C, and carrying on one end thefly-wheel D and on the other end the flywheel D and the frictiondriving-pulley E, which latter is thrown in gear with the flywheel D bymeans of the screw F,and thrown out of gear, so as to run as a loosepulley, by loosening the said screw F.

Stone and ore crushers have been run with a fast and a loose pulley onthe crusher-shaft and a pulley of corresponding width on the engine ordriving shaft; but such device is more expensive and absorbs more powerand is less compact and convenient than the arrangement herein shown.

G is the rigidly adjustable pitman that con.- nects the crank-shaft Bwith the lever-toggle H, and through or by which the motion of the saidcrank-shaft B is transmitted to the oper ating part of the crusher.

In the lever pattern, Blakes crusher, the only adjustable part by whichthe distance between the jaws at the bottom can be regulated is a wedgeoperated by a screw-nut that can be raised or lowered between thecrusher-frame and the rear toggle-block, so that it can move saidtoggle-block forward or back an inch, or thereabout; but this limitedthe lever-bearing hence some of these parts in some instances requirefrequent renewal in order to restore the crusher to its normal workin gcondition.

- In a more recent pattern of Blakes crusher a like wedge fixed betweenthe frame and the toggle-block is the chief agent for the adj ustment ofthe wearing parts.

In neither of these cases is the pitman of the crusher adjustable inrelation to any of the wearing parts named, it being adjustable only bymeans of a beveled key or keys, that may be made to move thecrusher-journal brasses as they wear under the action of the crankshaft.

The adjustable pitman G herein shown is composed of two parts that screwtogether, so that it can be made longer or shorter at will, and at thesame time always preserve the absolute rigidity that is essential to theproper working of the crusher. To compensate at any time for the wear onthe wearing parts of the crusher the two parts of this pitman G may bepartially unscrewed from each other, and when the worn parts of thecrusher are renewed the pitman may be shortened by screwing together itsparts to its primary condition.

H is the toggle-lever, whose long horizontal arm is connected to thecrank-shaft B by the .pitman G. A pin, a, that passes through theslotted holes b in the sides of the crusherframe A and through the ear 0of the leverH itself, forms, in combination with the toggleblock I, thefulcrum of the said lever H. In the face of the enlarged head of thetoggle-lever H is a deep horizontal groove, d, having outward-curvingedges, and opposite, in the back of the movable jaw K, is a similargroove, f. Set between the head of the lever H and the movable jaw K,and with an end resting in each groove (1 f, is the toggle L.

K is the movable jaw, that swings on a shalt, N, which rests in theboxes 0 on the sides of the frame A. p

1? is the fixed jaw, that is secured to the frameA. I

Q Q are the removable jaw-plates between which the ore or othersubstance is crushed.

The plate Q is held in place partly by the studs g, that project fromthe movable jaw K, and partly by the screw-bolt it, while the plate Q isheld in place by the cheek-plates R R and the studs 9, that project fromthe jaw P and enter the inclined sockets t 2'. These sockets t t" areintended to be inclined in both plates in opposite directions, so thatthey will serve the purposes for which they are designed whichever endof the plates Q, Q be set uppermost in the crusher. The purposes ofthese sockets i t" are primarily to assist in securing the plates Q Q inposition, and, secondly, to afford good holds for hooks that may beinserted to lift the said plates to or from their positions. By thesemeans the plates Q Q, can be set in place or removed without the usualrisk of accident.

T is a wedge, vertically movable by means of the thumbscrew k, for thepurpose of ad justing the toggle-block I, to compensate in a measure forthe wear on the wearing part of the crusher.

In many of the crushersnowin usein which motion is given to the movablejaw through the medium of togglcsit will be observed that the saidtoggles areneverbronghtin a straight line with each other at any partofthe stroke, and that consequently the full power of the applied force isnotdeveloped. In the crusher herein described, however, the toggleisthrust straight out in a horizontal line at the end of the stroke, sothat a most positive and unyielding pressure is exerted by the movablejaw K upon the material to be crushed. The spring S serves to retractthe jaw K after every forward motion.

In other crushers the toggles are never in a straight horizontal linewhen they exert their maximum force; hence at that instant a severebackward thrust or pressure is always transmitted to the crankshaft asit is on a deadpoint, turning the center, thereby causing undue strainand wear upon the bearing points of the said crank-shaft, as well asupon the bearings of the attached pitman. In this improved machine,however, when the crankshaft is on a center and the toggle issimultaneously exerting its greatest force the said toggle is in astraight horizontal line, so that no back pressure or thrust is at thatmoment transmitted to the bearings of the pitman or shaft. (Jonsequentlythe ordinary wearand distortion of these points is in a great measureavoided.

I do not claim, broadly, an adjustable pitman for a stone-breaker.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. In an ore-crusher or stone-breaker,the adjustable pitman Gr, constructed in two parts that screw together,in combination with the crank-shaft B, lever B, and toggle L, substantially as herein shown, and for the purpose described.

2. The toggle-lever .lI, having an enlarged head with ear 0 and groove(1, in combination with the toggle-block l, toggle L, and movablejaw K,all constructed and arranged as shown and described.

3. In an ore-crusher, the movable plates Q, Q, provided with inclinedsockets it, in combination with the crusherjaws, substantially as andfor the purposes described.

SAMUEL LOlVE MARSDEN.

Witnesses:

1:. I. STORER, (J. SEDGWIGK.

